Convert a sparse matrix to a full matrix - R

Question

I am looking for an efficient way to convert a huge sparse matrix to a full matrix (not to a dataframe) in R?

Any idea?

Thanks.

Answer 1

We can use as.matrix

m1 <- as.matrix(sM)

where sM is the sparse matrix.

We can check the methods

grep("as.matrix", methods(class = "sparseMatrix"), value = TRUE)
#[1] "as.matrix,Matrix-method"